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Preheat oven to 350 degrees.
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Melt butter and combine with dried onions, sugar, mustard and poppyseeds.
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Horizontally slice Hawaiian rolls.
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Place bottom layer of Hawaiian rolls on a baking sheet and layer with shaved ham and cheese.
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Spoon half of melted butter mixture onto cheese and place top layer of rolls on top.
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Brush or spoon second half of melted butter mixture on top of rolls.
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Bake for 12 - 15 minutes or until cheese is melted and rolls are golden brown.
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Cool for 5-8 minutes, slice, and serve.